What was found in Southbury's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 3400 µg/L 34% of the EPA limit 10000 µg/L Highest in the city: OAKDALE MANOR WATER ASSOCIATION · 40 people · 2019 | 3/4 | SYR4 |
| Nitrate-Nitrite | 3400 µg/L 34% of the EPA limit 10000 µg/L Highest in the city: OAKDALE MANOR WATER ASSOCIATION · 40 people · 2019 | 3/4 | SYR4 |
| Copper | 969 µg/L 75% of the EPA limit 1300 µg/L Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2018 | 4/4 | SYR4 |
| Fluoride | 94 µg/L 2.4% of the EPA limit 4000 µg/L Highest in the city: SOUTHBURY TRAINING SCHOOL · 816 people · 2019 | 2/4 | SYR4 |
| Chromium | 38.49 µg/L 38% of the EPA limit 100 µg/L Highest in the city: SOUTHBURY TRAINING SCHOOL · 816 people · 2019 | 1/4 | SYR4 |
| TTHM | 31.36 µg/L 39% of the EPA limit 80 µg/L Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2019
Highest in the city: 32.24 µg/L — SOUTHBURY TRAINING SCHOOL · 816 people · 2019 | 3/4 | SYR4 |
| Barium | 30 µg/L 1.5% of the EPA limit 2000 µg/L Highest in the city: SOUTHBURY TRAINING SCHOOL · 816 people · 2019 | 3/4 | SYR4 |
| Combined Uranium | 18.9984 µg/L 63% of the EPA limit 30 µg/L Highest in the city: OAKDALE MANOR WATER ASSOCIATION · 40 people · 2019 | 1/4 | SYR4 |
| Bromoform | 2.385 µg/L No EPA limit set Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2019
Highest in the city: 14.2 µg/L — OAKDALE MANOR WATER ASSOCIATION · 40 people · 2019 | 3/4 | SYR4 |
| Chloroform | 13.8 µg/L No EPA limit set Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2019 | 3/4 | SYR4 |
| Bromodichloromethane | 10.495 µg/L No EPA limit set Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2019
Highest in the city: 11.94 µg/L — SOUTHBURY TRAINING SCHOOL · 816 people · 2019 | 3/4 | SYR4 |
| Dibromochloromethane | 7.95 µg/L No EPA limit set Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2019 | 4/4 | SYR4 |
| Lead | 5.5 µg/L 37% of the EPA limit 15 µg/L Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2018
Highest in the city: 7.7 µg/L — SOUTHBURY TRAINING SCHOOL · 816 people · 2019 | 4/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 6 µg/L 10% of the EPA limit 60 µg/L Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2019
Highest in the city: 6.92 µg/L — SOUTHBURY TRAINING SCHOOL · 816 people · 2019 | 3/4 | SYR4 |
| Gross Alpha, Excl. Radon And U | 6.389 pCi/L 43% of the EPA limit 15 pCi/L Highest in the city: OAKDALE MANOR WATER ASSOCIATION · 40 people · 2019 | 1/4 | SYR4 |
| Trichloroacetic Acid | 0.7900 µg/L No EPA limit set Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2019
Highest in the city: 4.8 µg/L — SOUTHBURY TRAINING SCHOOL · 816 people · 2019 | 3/4 | SYR4 |
| Combined Radium (-226 And -228) | 3.03 pCi/L 61% of the EPA limit 5 pCi/L Highest in the city: SOUTHBURY TRAINING SCHOOL · 816 people · 2016 | 2/4 | SYR4 |
| Dichloroacetic Acid | 3 µg/L No EPA limit set Highest in the city: AQUARION-LAKESIDE · 455 people · 2019 | 2/4 | SYR4 |
| Dibromoacetic Acid | 1 µg/L No EPA limit set Highest in the city: SOUTHBURY TRAINING SCHOOL · 816 people · 2019 | 2/4 | SYR4 |
| PFOA | 0.0041 µg/L No EPA limit set Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2025 | 1/4 | UCMR-5 |
| PFBS | 0.0032 µg/L No EPA limit set Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2025 | 1/4 | UCMR-5 |
| Lead | 0.00070 mg/L 4.7% of the EPA limit 0.0150 mg/L Main supplier: HERITAGE WATER COMPANY · 7,300 people · 2026
Highest in the city: 0.0018 mg/L — SOUTHBURY TRAINING SCHOOL · 816 people · 2025 | 4/4 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Southbury
| Supplier | Population served |
|---|---|
| HERITAGE WATER COMPANY | 7,300 |
| SOUTHBURY TRAINING SCHOOL | 816 |
| AQUARION-LAKESIDE | 455 |
| OAKDALE MANOR WATER ASSOCIATION | 40 |
Frequently asked questions about Southbury tap water
Is Southbury tap water safe to drink?
EPA testing detected 22 contaminants in the water serving Southbury. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Southbury?
4 public water suppliers report drinking-water monitoring for Southbury, Connecticut to the EPA. Each is listed above with its population served.
What contaminants are in Southbury's water?
The contaminants EPA monitoring detected in Southbury include Nitrate, Nitrate-Nitrite, Copper, Fluoride, Chromium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.